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ICD-10-PCS 2027 procedure code

09CC4ZZExtirpation of Matter from Left Mastoid Sinus, Percutaneous Endoscopic Approach

✓ Valid for 2027O.R. procedure

Short description: Extirpate of Matter from L Mastoid Sinus, Perc Endo Approach

Code unchanged since ICD-10-PCS took effect on October 1, 2015. Source: official FY2027 ICD-10-PCS release from CMS. Page updated September 29, 2026. About our data

About 09CC4ZZ

09CC4ZZ is the ICD-10-PCS code for a extirpation procedure on the left mastoid sinus using a percutaneous endoscopic approach. In ICD-10-PCS, extirpation means taking or cutting out solid matter from a body part.

In plain terms, this corresponds to incision of mastoid and incision of petrous pyramid air cells, the ICD-9-CM procedure titles it maps to (20.21 and 20.22).

For a different body part, codes include 09C04ZZ (right external ear), 09C14ZZ (left external ear), 09C34ZZ (right external auditory canal), 09C44ZZ (left external auditory canal), 09C74ZZ (right tympanic membrane), 09C84ZZ (left tympanic membrane) and 16 more.

The same procedure with a different approach is coded 09CC0ZZ (open), 09CC3ZZ (percutaneous) and 09CC8ZZ (via natural or artificial opening endoscopic).

It is an operating-room procedure in the MS-DRG logic for DRG 135 (Sinus and Mastoid Procedures with CC/MCC) and DRG 136 (Sinus and Mastoid Procedures without CC/MCC), under the surgical category “Sinus and Mastoid Procedures”.

It has been valid since ICD-10-PCS took effect on October 1, 2015.

What each character means

1. Section
0Medical and Surgical
2. Body System
9Ear, Nose, Sinus
3. Operation
CExtirpation

Taking or cutting out solid matter from a body part

The solid matter may be an abnormal byproduct of a biological function or a foreign body; it may be imbedded in a body part or in the lumen of a tubular body part. The solid matter may or may not have been previously broken into pieces

Includes: Thrombectomy, choledocholithotomy

4. Body Part
CMastoid Sinus, Left

Includes: Mastoid air cells

5. Approach
4Percutaneous Endoscopic

Entry, by puncture or minor incision, of instrumentation through the skin or mucous membrane and any other body layers necessary to reach and visualize the site of the procedure

6. Device
ZNo Device
7. Qualifier
ZNo Qualifier

Other versions of this procedure

MS-DRG v44.0 grouping

All DRGs →

Surgical MS-DRGs this procedure can group to, depending on the principal diagnosis's MDC.

MDC 03 · Diseases and Disorders of the Ear, Nose, Mouth and Throat · Sinus and Mastoid Procedures

ICD-9-CM equivalent

Converter →
  • 20.21Incision of mastoidapproximate
  • 20.22Incision of petrous pyramid air cellsapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about 09CC4ZZ

Is 09CC4ZZ a valid ICD-10-PCS code for 2027?

Yes. 09CC4ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is 09CC4ZZ an O.R. procedure?

Yes. 09CC4ZZ is an O.R. procedure in MS-DRG v44.0.

What DRG does 09CC4ZZ group to?

Depending on the principal diagnosis, 09CC4ZZ can group to MS-DRG 135 and MS-DRG 136.

What is the ICD-9 procedure code for 09CC4ZZ?

The CMS GEMs map 09CC4ZZ to ICD-9-CM 20.21 (Incision of mastoid) and 20.22 (Incision of petrous pyramid air cells).